This solution is relevant for those using Microsoft Office Outlook 2016, 2013 and 2010.
1. Click the 'File' tab, and then click the 'Info' tab in the menu.
2. Click 'Automated Replies (Out of Office)'.
3. In the 'Automatic Replies' dialogue box, select the 'Send Automatic Replies' check box.
4. If you want to specify a set time and date range, select the 'Only send during this time range' check box. Then set the 'Start time', and then set the 'End Time'.
5. You can choose to send different messages to people 'Inside my Organisation' and 'Outside my Organisation'. Simply click the relevant tab and type the messages you'd like followed by clicking 'OK'.